Eulerian-Eulerian Modeling of Disperse Two-Phase Flow in a Gas-Liquid Cylindrical Cyclone

[+] Author and Article Information
Miguel A. Reyes-Gutiérrez

Departamento de Termodinámica, Universidad Simón Bolívar, Valle de Sartenejas, Baruta, Caracas, Mirands 1080, Venezuela

Luis R. Rojas-Solórzano

Departamento de Conversión de Energía, Universidad Simón Bolívar, Valle de Sartenejas, Baruta, Caracas, Mirands 1080, Venezuela

Juan C. Marín-Moreno

CEMFA, Universidad Simón Bolívar, Valle de Sartenejas, Baruta, Caracas, Mirands 1080, Venezuela

Antonio J. Meléndez-Ramírez

Departamento de Termodinámica, Universidad Simón Bolívar, Lab. de Mecanica de los Fluidos, Edif Fluidos y Operaciones Unitarias Of. FOP-103, Valle de Sartenejas, Baruta, Caracas, Mirands 1080, Venezuela01-81496@usb.ve

José Colmenares

 Gerencia de Exploración y Producción, PDVSA-INTEVEP

J. Fluids Eng 128(4), 832-837 (Nov 09, 2005) (6 pages) doi:10.1115/1.2201623 History: Received August 12, 2004; Revised November 09, 2005

This work presents a three-dimensional computational fluid dynamics (CFD) study of a two-phase flow field in a gas-liquid cylindrical cyclone (GLCC) using CFX4.3 ™, a commercial code based on the finite volume method. The numerical analysis was made for air-water mixtures at near atmospheric conditions, while both liquid and gas flow rates were changed. The two-phase flow behavior is modeled using an Eulerian-Eulerian approach, considering both phases as an interpenetrating continuum. This method computed the inter-phase phenomena by including a source term in the momentum equation to consider the drag between the liquid and gas phases. The gas phase is modeled as a bimodal bubble size distribution to allow for the presence of free- and entrapment gas, simultaneously. The results (free surface shape and liquid angular velocity) show a reasonable match with experimental data. The CFD technique here proposed demonstrates to satisfactorily reproduce angular velocities of the phases and their spatial distribution inside the GLCC. Computed results also proved to be useful in forecasting bubble and droplet trajectories, from which gas carry under (GCU) and liquid carry over might be estimated. Nevertheless, moderate differences found between the computed GCU and experimental measurements suggest that new adjustments may be done to the numerical model to improve its accuracy.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Gas-liquid cylindrical cyclone

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Figure 2

Dimensions of the GLCC model

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Figure 3

(a) Surface mesh at separator midsection highlighting element agglomeration around the injection point; (b) typical transversal section of the volumetric mesh in the separator body

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Figure 4

Coplanar sampling points for determining the computational mean angular velocity

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Figure 5

Comparison of computational and experimental mean angular velocity for single-phase flow. Q1=7.8×10−4m3∕s, Q2=15.7×10−4m3∕s and Q3=23.0×10−4m3∕s.

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Figure 6

Computed capturing surface for single phase flow. Q3=7.8×10−3m3∕s.

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Figure 7

Comparison of simulated and experimental free surface for qg=0.047sm3∕s. Left: ql=0.0073m3∕s; right: ql=0.011m3∕s.

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Figure 8

Comparison of simulated and experimental free surface for qg=0.047sm3∕s and ql=0.0143m3∕s

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Figure 9

Three-dimensional view of the capturing surface for qg=0.047sm3∕s, ql=0.011m3∕s

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Figure 10

Volume fractions at mid-longitudinal plane of GLCC for qg=0.047sm3∕s and ql=0.011m3∕s




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